In the twelve days leading up to Christmas, the residents of the snowy and isolated town of Woodridge are being murdered in a variety of gruesome ways by a psychotic Santa and Mrs. Claus. While the small-town cops scramble to protect the townsfolk, the killings seem to center around one young woman who may be the final victim on Santa's list. As the slaughter continues and the bodies pile up, it seems that nothing and no one may be able to stop the murderers before they complete their own deadly take on the twelve days of Christmas.
A couple in a car about 17:00 - 17:46. Later in the movie it is stated several people died when a mental institution caught fire a year before the movie takes place.
It's not on-screen or graphic but it's heavily implied that the killers attack a mother and daughter in their home. Her body is seen later in the movie.